Another suggestion. A human rest phase, like after it runs for a few hours, say 5 or 8 it will cease to like pages for certain duration or a period of another hour or two. This will be okay since there will be proxy support for other accounts.
Seriously, if twiends pays attention to those times that you are liking those pages and find out that you've been liking pages for 48 hours continuously, it will know that you're a freaking bot and they will kill the process by which you like those pages, and will ultimately kill the bot.
That human rest phase can also be measure in points, like after accumulation of 3k twiends points. You can also opt it as the basis for plans in your software, say free users can only acquire 2k points per 24 hours, premium 1 can have 4k points in 24 hours and so on. You get the idea. This way freeloaders and abusers will be minimized.