The biggest pro to using any of these tools to produce a professional portfolio is that it makes it easy for employers to get your information and professional work history without you having to mail, email and/or fax a resume.
Another pro to using any of the three websites is employers can get a feel about what type of person you are based on personal information submitted during the registration process for these sites.
by using these professional profile networking websites is you are exposed to the world meaning greater possibilities in the job market
My Biggest concern with using these websites is the exposure of ones personal information
Another con is there is a possibility that your information might not get seen by potential employers.
There are too many of these kind of tools on the internet. This can be very confusing to keep track of.