On signature ads for sure
In first month you'll be newbie; Let's say you posted 50 in the first month and each post paid you 0.0001 btc; That's: 0.005 BTC
On the second month you'll be Jr member; Let's say you posted another 50 and you'll get 0.0002 for each; That's 0.01 BTC
On the third & fourth month you'll be Member; Let's say you posted 100 posts during those 2 weeks and 0.0003 for each; That's 0.03
After 4 months you'll be Full Member and you'll be paid at least 0.0007 btc for each post. (4 months will take to become Sr.) During that 4 months let's say you've posted 250 messages thats; 0.175 BTC
After being Sr; (You've 4 months to complete 1 year) you'll get at least 0.001 btc for each post; Let's say you post 3 in a day 3 * 120 = 360 and that's 0.360 BTC.
Total; 0.580 BTC.
(Reminder; Those are calculations for minimal post, Daily 2-3 posts enough to make half a bitcoin in a year on signature ads)
Ps: All of your posts should be constructive.
Ps 2: You can use lots of accounts