A JV giveaway event is a site created by online marketers who agree to use their lists to help strengthen the mailing lists of all the marketers included. By taking part in such an event each member has the potential to build up their own opt-in list by utilizing the total power of all the other list builders who are participating.
The way it works is every single participant of the JV giveaway register one or more free products along with their squeeze pages that they will make use of to gather new leads. They then agree to email their mailing list on launch day advertising the event and all the gifts being given away by other marketers.
Are
JV giveaway events really a decent way to create a list fast? The answer to this question is: it depends on the situation. If you are holding your own JV giveaway event than it most certainly is.
Even if you are unpracticed and the event is not so well conducted, you will develop your list by 100's if not 1000's of subscribers. Successful events may add to your mailing list many 1000's of new subscribers but you will need to really be great at it and have a reputation that attracts people. You will benefit greatly if you could find yourself a experienced partner to conduct the event together.If you are signing up for someone else to giveaway as a contributor than you will grow your subscriber list.
Will it be a huge growth? Again - it depends on the situation. If this is a well established event (running at the same time of the year for several years) and if you do great work with your submission (more on that later) then you can see 100's of new subscribers on your list. However, most of the JV giveaway events I've seen are either conducted by unacquainted people or are conducted by "professional" event creators on behalf of others. Sadly, many of those are not so well run and the results for contributors are way worse than one could hope for.
Conclusion
JV giveaway events are one way of building your mailing list. Use them well and you will benefit.
Use other ways to build your list as well; don't rely on JV giveaways alone.