I refer to 's "Is there any room for Changetip on Steemit?" article on steemit a while ago, and find the concept of ChangeTip rather interesting- Sending cents across the globe as tips where the fees to send cents simply does not make sense.
To tip, user can tip another with any gif of choice:-
choosing an amount pre-determined by the user himself.
To receive a tip, publish your tip.me URL so that others will know where to go to.
Disqus, Facebook, Github, Google+, Reddit, Stocktwits, Soundcloud, Slack, Tipworthy, Tumblr, Twitch, Twitter, Wordpress and YouTube are ChangeTip-friendly.
Tipping is currently free, BTC deposits are free, withdrawal of bitcoin and USD withdrawals (but bank charges are payable) are currently waived.
So, if you trust it enough, you can essentially use that as a free BTC wallet.
I guess right now, the main problem is the lack of ChangeTip users.