主要就是，以後所有網站都可以裝上 Facebook 的工具列，上面有 Like 鈕可以讓你按。你只要登入 Facebook 後，到任何有 Facebook Like 鈕的網站，喜歡的話按一下 Like，然後（1）你 Facebook 的 News feed 就會廣播你剛剛 Like 了某網站，（2）往後你 Facebook 上的朋友，只要逛到該網站，它就會跳出你的個人圖像，提醒你朋友說你曾經 Like 過它。
所以以後只要登入 Facebook 一次，在網路上到處都可以使用 Facebook 的推薦（Like）功能跟朋友互動（還可以線上交談）。當然前提是很多網站都裝了 Facebook 的 Like 鈕。你將會即時知道你朋友現在喜歡哪些網頁，在你上網時會馬上知道這個網站曾經有你哪些朋友喜歡或推薦。而這些你個人和你朋友群的網路使用偏好都可能成為你在 Facebook 公開資訊（Profile）的一部分。
不過這可以在 Facebook 裡的設定作變更。在 "Account" → "Privacy settings" → "Profile information" → "likes and interests" 設定裡，把設定值從 "everyone" 改掉就可以了。
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What you should know about Facebook's changes
By John Sutter, CNN
April 22, 2010 -- Updated 1513 GMT (2313 HKT)
STORY HIGHLIGHTS：
* Before, "like" buttons only were on Facebook.com;
Now, they'll be all over the place.
* Web sites will be able to add new Facebook toolbars to
the bottom of their pages.
* New features will show whether or not you enter a user
name and password on a site.
San Francisco, California (CNN) -- Facebook announced some changes on Wednesday that are intended to make the Internet more social. Essentially, Facebook is stretching out into the rest of the Web.
But what do these new features actually mean for everyday people who use the Internet?
And when you see these Facebook-looking features popping up on other Web sites, how do you know what to do with them?
Here's a quick guide, based on a comments by Mark Zuckerberg, Facebook's founder and CEO, and interviews with developers who create applications for the massively popular social-networking site:
"Like" buttons
Buttons with the word "like" and a thumbs-up icon on them are going to start popping up all over the Internet. By clicking one, you indicate that you find the content interesting, relevant or helpful. Basically, you would recommend it to a friend.
Before Wednesday, "like" buttons only were on Facebook. Now, they'll be all over the place, including on this site. When you click one, you post the item -- whether it's a blog post, photo or celebrity web page -- to your Facebook news feed.
The "liked" content may also become part of your Facebook profile, and visible to your friends or to everyone, depending on how your privacy settings are configured on Facebook.
Friends' faces
A consequence of these "like" buttons will be that your friends' Facebook profile photos will start showing up all over the web.
If you see your friends' smiling faces online, it's an indication that they have clicked a "like" button on the Web site you're visiting. In a way, they're recommending it to you.
Facebook says these recommendations and social connections are the basis for the future of the Internet. Boring old hyperlinks are becoming something of the past, the company says.
No log-ins
These new Facebook features will show up regardless of whether or not you have entered a user name and password on a particular Web site.
So, say you go to Pandora to listen to music. If you have logged in to Facebook recently, you won't have to do anything on Pandora to see suggestions about music. Recommendations from your Facebook friends will automatically show up.
Toolbars
Facebook announced new toolbars that other Web sites can add to the bottom of their pages. The toolbar lets you "like" a particular web page or item, and gives you information about what your friends think of the page you're viewing.
You can also chat with friends who are currently logged in to Facebook without visiting the site.
Privacy issues
Some Internet users might worry about the fact that their Facebook profile photos, as well as their likes and dislikes, are going to show up all over the web.
At least for now, a person's likes and dislikes are only as visible as they want them to be.
But, if nothing else, that means you should probably double-check your privacy settings.
Go to Facebook, look at the top right of the screen and click the "Account" tab. Choose "Privacy settings" and then navigate to "Profile information."
Check the "likes and interests" setting. If you have that set to "everyone," then anyone on the Internet could see which Web pages you have liked.
Some users might only want their Facebook friends to see that information.
Facebook everywhere
One overarching thing you might notice is that Facebook is going to be all over the Internet with these changes.
This puts the social network at odds with Google, which also is trying to organize the world's information by interests and preferences.
Another potential side effect: The web you see is the web your friends like.
Without some effort, you might end up browsing based on your friends preferences, rather than exploring new territory. Your activity can influence them, too.
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