Where are you getting this 280,000 per mh from? Average diff over 7 days is 1.9 and it's at 1.8 now. That gives 110,000 if you're lucky at 1 mh. BS post.
Diff has been 1.9 indeed, but 0.7 also in the last few days. If you mine the coin a while you'll see difficulty drop and rise.
Recently the coin spiked at 200 satoshi at Poloniex. And I'm not talking about an "optical" spike like you see on cryptsy but a real spike where all orders up to 200 were filled.
Difficulty went to 9 I believe and since then there's been more interest in the coin. Diff has been a bit higher overall since.
I haven't been calculating lately because every time I did, SOC was the most profitable compared to all other coins.
I was actually happy SOC wasn't listed on the comparison sites 'cause that meant more coins for me;)
It looks like the coin is about to take off now so I don't know what the future brings. All I can say is that SocialCoin is very profitable and has been THE most profitable at times in the past.
This may be your last chance mining the coin with such low difficulty and 10k blocks. Only a few blocks left before it's halved to 5k.