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Why not shorten it to "some Philadelphians suck"? It's shorter and, arguably, more accurate.
>The 140 character limit and general focus on brevity encourages people to drop specificity and shift to bold proclamations and absolutes.
I disagree that the limit encourages vagueness, bold proclamations, and absolutes. Those are side effects of not stopping to think about how to effectively convey a greater-than-140-characters thought in less than 140 characters (without changing its meaning.)
Twitter seems better for personal use. Advertising/commercial use is everywhere, and it's nice to have a tool that's relatively uncluttered where I'm not being "targeted".
There are several advantages of twitter being "a standalone 'away message' platform" over Facebook:
•It's simpler (both in its look and its goal). I don't have to worry about applications, games, polls, or whatever else people do on Facebook that isn't communicating a single, focused idea, link, or observation. To me all that stuff isn't added value, it's just more baggage.
•Following can be one-sided, whereas friending is an agreement and is based on a real-life identity. I don't need to have a pre-existing connection to follow or be followed on twitter. Because Facebook is based on who you actually are, it doesn't have a "shit my dad says" or a "yelling bird" or whatever else that's silly and entertaining unless you have that one hilarious friend.
I get it- they are supposed to convey travel/adventure/situations where your app would be useful- but the images mostly communicate "hastily edited clip art" to me. (Maybe try the same gradient as the header?)
Otherwise, nicely done.