How do open source companies avoid harmful contributions and find the useful ones?

Because wikipedia is open source, I can modify anything I want. But what happens if someone deletes, adds bad content, modifies useful content ? What does wikipedia do to prevent that ?

The last question is available for any other open source software: linux, php etc. How do they know which contribution is useful and which is harmful ?
Thank you.

How Open Source Projects Survive Poisonous People (And…

Ever have trouble getting your point across about open source? If so, this video is for you.

Google Tech Talks January 25, 2007 ABSTRACT Every open source project runs into people who are selfish, uncooperative, and disrespectful. These people can silently poison the atmosphere of a happy developer community. Come learn how to identify these people and peacefully de-fuse them before they derail your project. Told through a series of (often amusing) real-life anecdotes and experiences. Credits: Speaker:Ben Collins-Sussman, Speaker:Brian Fitzpatrick

How Do I Update Open Office?

How do I update my version of openoffice 2.0 to 2.x

Would I need to download a complete new version of open office 2.x
Would I need to deinstall my version of OO 2.0 first?

some tips?
1 please read the question ( do I need to download the whole open office again )

2 I do not found the answer on the open office site

3 nothing in the open office 2.0 help about update
what I have found:
-you need to load the entire file to actualize the previous version of OO
– you dont’ need to uninstall the previous version, – the new one will install upon it

Where Can I find open source?

Here is an interesting question I found out there in the net.

Where can I find a open source Unix download for free, every time I find a new one I get a virus from it, it really sucks

I suppose this person is not picking up the source code from a relizble source.  If you want to find the download, the best places to visit are the links on the Blogroll on the right of this page.  You will not pick up a virus from these folks.

How Can I Change Open Office File Extentions to Save For Windows?

I recently downloaded Open Office Suite with every program. I was very please and impressed by their programs. Their like the mirror image of Microsoft Office. I didn’t like the fact that it didn’t have a program like Outlook, though I have Mozilla Thunderbird. But my question is, is there a way to have everything I create (word, presentation etc) automatically save as a Word or Powerpoint file? I want this because I do work for school and my school doesn’t have open office so every time I use my flash drive to open a document created by open office it doesn’t work. So can I just change is so its Word and Powerpoint even though its Impress and Writer! THANKS!
I basically want to have the file extension change by auto!