faceflip.user.js
Flips all images in Facebook upsidedown. Works in Greasemonkey and Google Chrome.
faceinvert.user.js
Inverts Facebook wholly. Works in Greasemonkey and Google Chrome.
twitter_hashtag_filter.user.js
Twitter hashtag filter. Works in Greasemonkey only.
twitter_no_recommendatio.user.js
Remove "Who to follow" section. Works in Firefox and Chrome.