I've noticed that when you tweet a link, there are a number of bots that almost immediately follow the url, without subsequently loading the page assets. As an informal test, I posted a link and took a look to see how long it took them to jump on the link. The tweet had a link, but no hashtags.
|Bot||Time to Act on Link in Tweet|
|MetaURI API/2.0 +metauri.com||3 seconds|
|Someone's HTMLParser/2.0 Scraper||3 seconds|
|TweetmemeBot/4.0; +http://datasift.com/bot.html||4 seconds|
|? (nslookup failed)||4 seconds|
|Google-HTTP-Java-Client/1.17.0-rc (gzip)||4 seconds|
|Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp||4 seconds|
|Kraken/0.1; http://linkfluence.net/; firstname.lastname@example.org||24 seconds|
|A sole HEAD curl from compute-1.amazonaws.com||31 seconds|
|Something from vodafonedsl.it||43 seconds|
|Something from trendmicro.com||49 seconds|
Nothing big here, just curious to take a look at some of the quick watch-bots out there at the moment.