One of the potential upsides to posting stuff on Twitter or Facebook ought to be that you can find it later when you want to know what you were doing/thinking/saying at a given time.
Too bad neither site has a good way of searching your own contributions.
Twitter does have a search feature and you can restrict it to your own tweets by adding your username but it only returns very recent tweets (like maybe the last week); Twitter is also indexed by the major web search engines and if you add “site:twitter.com username” to your queries you may or may not find what you’re looking for with minimal additional cruft; there’s also Snap Bird which is a 3rd party site designed to do this but it’s clunky and I’ve never seen it actually work (maybe the fault of Twitter’s API, who knows).
Facebook does have a search feature but it inexplicably doesn’t search your own updates (it finds people and pages and if you click the “See more results for…” link then a tantalizing “posts from friends” link appears which doesn’t seem to find content in posts by me or my friends); Facebook is a walled garden and its content is generally not indexable by external search engines; it does have a pretty good API and so somebody could probably go build this as a 3rd party app but I’m not aware of one, and arguably it would be better done as part of the core site anyway.
So, on those occasions I do want to go track down one of my own updates on either of these sites, I resort to viewing my own profile, then scrolling down, and clicking the “show older posts” link as necessary, and scrolling down, and repeating until I’ve gone back a couple months, and using my browser’s find-in-page feature to find what I’m looking for, eventually after way too much clicking and scrolling.
Not only is this ridiculous, it’s made even worse by an interaction with Google Chrome (and maybe other browsers, but Chrome’s what I’m using lately). Apparently the AJAXy way these sites use DOM writes or whatever they do to append content to the current page without reloading triggers this behavior in Chrome where “Find Again” (ctrl-G or Command-G) doesn’t find text in newly added parts of the page. So often, I’ll load the page and scroll back a month or so and then use the browser Find command to search for “widgets” and not find it, then scroll another month or so and then hit Command-G and not find it, then scroll back another month or so and so on… and after going back 6 or 7 months, I’ll remember that Command-G doesn’t work, and cancel the search and repeat the search with Command-F and then command-G and then it will find it halfway up the page, which I would have found a lot easier if Command-G had worked the first applicable time. (This was a pattern I learned with earlier versions of Chrome; using Chrome 10, it’s a little different — the first Command-G may actually scroll the search hit into view, but it won’t highlight it and you won’t notice it on a busy page, and it will keep reporting “0 of 0” in the search status pane; you still need to do the 3-step deselect, Find, Find Again dance to get it to highlight.)
(Side note on Facebook: there’s a metafilter question asking how to search your own Facebook profile; not only do the answers there not have a solution, but the overall feeling is highly negative on it even being possible. That’s not quite true; I’ve confirmed that using the Facebook API from a simple Python script I can get back anything I ever posted. They do keep it, and they or someone else could write an indexer and search tool.)