This story from Wired covers a nifty new tool called Wikipedia Scanner that lets you see who (what IP address) has been editing Wikipedia entries although it is somewhat old news as the examples given are all pre-2006. 

I suppose there are two ways to look at this: 

1. Changes like those made by Diebold & Wal-Mart editing critical comments are not in the "spirit" of a "collaborative" effort like Wikipedia or as an entry stated  – are "vandalism."
2. Because this is a definition based on the collaborative input of the community, then everyone in the community is understood to be a participant with the "facts" rising to the top after numerous public iterations.

Now, I often reference Wikipedia definitions here because I like the fact that they are dynamic and can be a bit more colorful than Merriam-Webster.  However caveat emptor because anybody can edit an entry which again is the unique thing about this social dictionary. 

One person’s fact could be another person’s fiction.

Bottom line – this is a place people go for information and companies/organizations want to make sure their brands are presented in the best light possible.  This should not be a surprise to anyone and is hardly scandalous.