Anyone can edit so this may be too open for some applications, for example confidential documentation. However it is possible to regulate user access.
Open to SPAM and Vandalism if not managed properly. There are easy ways to restore a page however, and on WikiEducator you must be logged in to edit pages so this reduces vandalism by automated spam bots.
Requires Internet connectivity to collaborate, but technologies to produce print versions of articles are improving
The flexibility of a wiki's structure can mean that information becomes disorganised. As a wiki grows, the community plans and administers the structure collaboratively.