What's with all the min raises ?

[Robbr25]

I play .25/.50 NL at Poker Stars and I see min raises all the freakin time.
Not sure what to make of the play most of the time.
Any thoughts of how to play against min raisers.
Example:
I raise preflop 4XBB one caller.
I CB the caller min check raises.

I raise preflop 4XBB one caller.
I CB they call I CB turn they min raise.

I raise preflop 4XBB one caller who has position on me.
I CB they min raise.