Remove All Facebook Ads: the only Greasemonkey script for Facebook you'll really need. No more adds in pages and sidebar, or "sponsored" items in news feed.
Embed Youtube Video in Twitter
Troy's Twitter Script for Greasemonkey is the definitive power tool for Twitter addicts. The feature list of this tiny script is amazing: my favorite is media embedding (view pictures or Youtube videos right from within Twitter), Retweet button, on the fly link shrinking when writing and expanding when reading, and much more. Check the full description with screenshots on @ArtemR'sā¦