Original sentence: Specific criticisms include the encyclopedia's exposure to obvious or subtle vandalism, attempts by strongly opinionated editors to dominate articles, inaccurate or sometimes non-existent sourcing for controversial assertions in articles, and edit wars and other types of nonconstructive conflict among editors.Wikipedia, a free content encyclopedia project written by volunteers, has attracted criticism along with its size and popularity
Edited sentence: Specific and oft-heard criticisms include the encyclopedia's exposure to obvious or subtle vandalism, attempts by strongly opinionated editors to dominate articles, inaccurate or sometimes non-existent sourcing for controversial assertions in articles, and edit wars and other types of nonconstructive conflict among editors.Wikipedia, a free content encyclopedia project written collaboratively by volunteers, has attracted negative criticism along with its size and popularity