I think there's a hidden rule that "If a lot of people
accept some one as their guru, so should you"
Don't Fall In This Trap.
In Sanskrit, Gu means darkness(ignorance) Ru means light(knowledge)
so guru means the one who dispels the darkness of ignorance.
You can consider some one as your guru if he/she really lead
you from darkness to light.
Always believe your gut feeling when choosing your guru/mentor.
There is no rule that you should have only one guru. Most probably you
need more than one person to help you to succeed as an internet marketer.
Here's my checklist to choose a guru
1) Be very clear about your business model
2) Choose someone who's already an expert in that business model
3) Make sure that YOU really like his/her way of teaching
4) It's best if there's a one to one coaching available
Always take action upon whatever you learn and remember the saying
"Experience is the best teacher"
Hope it helps