You must have several likes before you start to invest. They are:
1. like the proposition - it is simple yet valuable, it tackles real problem and disrupts rusty and dusty industry.
2. like the team - people from that alcurrency or new blockchain team. They seem like they are in for realz, and not just for quick scam bucks.
3. like the price - it still haven’t been pumped crazy high, like many other good coins, and the cap is pretty low too, so there is room for big growth.
4. like the project roadmap or documentation - it says that there will be many releases throughout 2017, so it will grab more attention soon. Or it will be pretty clear it failed to deliver soon (no need to wait for 5 years with this one!)
Good luck!