I get your points - they're valid. I'm a particular case on twitter because I have a very short username (@f) and actually miss many of my mentions when they ha

I get your points - they're valid. I'm a particular case on twitter because I have a very short username (@f) and actually miss many of my mentions when they happen at night (my account gets a huge amount of false positive mentions, some because of a regexp bug I reported to twitter years ago and that still hasn't been fixed). For people with very specific usernames (99.999% of users) that isn't an issue. Mind you, with my comment I didn't meant to diss the service - It just doesn't fit my particular use. I'm glad it fits other people fine. Good luck with the product!