I definitely have to agree with Uncle in that the person with the most "likes" wins... that is definitely the worst! I think a random draw is the best... Grids are popular, but, damn, they sure are a lot of work! I wouldn't wish that on anyone... You have people picking numbers, possibly in several rounds and someone has to keep track of all that..
Another type that confuses me a bit are the ones where you get say 10 entries. I find that people will put them in all at once and then forget about the
thread entirely... If you don't enter all at once, it is easy enough to forget how many posts you have already made... especially for older minds, lol!
There are others that allow you to enter as often as you wish, but NOT double post... That would allow people who are around a lot to get more chances... That could be a bad thing, especially if you eliminate the no double posting requirement.
However, I think the whole point is to keep people coming back to your thread, reading and posting... Keep bumping it up to the top, keep your company in the minds of your customers and customers to be...
How do you do that? Well, it must be fun. There have been some threads that wrote stories or did mad libs or said something about a certain subject... A lot of those were a blast! The facebook contests and ones that require you to photoshop restrict your audience to the people who do those things... So, make it fun and easy enough and definitely random!
That's about all I have for now, I think it's great and it will bring a lot of attention to your fabulous new business! All the best to you!