Giveaways - Help please!

As you all know and can see from my blog site, that BTW needs a serious facelift, I am new to the world of blogging.  Swatching the nail colours of ASK Cosmetics was a real challenge at first, but I am determined to show you the latest additions to our growing Nailwear line-up over the next few days.  There is a lot of inspiration to be taken from all the bloggers' sites.  Accent nails is a trend I am really drawn to at the moment.  Sorry, I am getting off track here.

When visiting all the various blog sites, I come across all kinds of giveaways, most of which are "follower" giveaways.  These seem to be the most popular by far.

I am very lucky in the sense that I have a company behind me that is generous and loves sharing their products.  But here is my question for you: 

• Do you personally like taking part in "follower" giveaways, in which the blogger celebrates by/when reaching a certain number of followers?
• Which products from our line-up would you prefer to win?
• How long should giveaways run - 2 weeks, 3 weeks, 1 month?

Your feeback and any comments are greatly appreciated, as always. So, let me know your thoughts on the whole giveaway concept.

It is rainy and icy in my neck of the woods - hope you are in the sunshine!   Lisa M.