Yes, there are a number of us who come and go as the mood strikes us. I haven't been around for that long, and tend to answer more than just questions directed at our religion. In many cases, I recognize the trolls -- the haters -- and don't bother responding to their misrepresentation of our religion.
You'll find that most people who hate us also hate religion in general. And I'm not talking about atheists or agnostics, but people who have no use for religion. The other big group are apostates who may have left because of hurt feelings or whatever. Some have decided that they know more about the religion and since the earliest days of the church have been the biggest headache for the church.
Fortunately, they are few in numbers, but make up for it in their various web sites and misinformation. The best anyone can do is to simply not respond to their trolling for attention and where honest questions are being asked, post the articles of faith and the "official" web sites. I also include an apologist site to address a lot of the misinformation, since we don't have time or the interest in addressing such foolishness.
You are welcome to follow the links, capture the addy's and build your own list of web sites that work for you.
Official "Mormon" links:
http://www.mormon.org/mormonorg/ -- an introduction to the LDS faith.
http://jesuschrist.lds.org/ -- the "Mormon" (LDS) view of Jesus Christ.
http://www.lds.org/ -- contains many resources for members and those who are interested in the religion, including on-line scriptures, lesson manuals, talks, policies, and aids for LDS members.
http://www.fairlds.org/webguide.html -- an LDS apologist site that responds to the claims made about the LDS Church by critics and anti-Mormon groups.