If you have Microsoft Exchange installed in your environment, you can use the extension attributes that Exchange adds to the Active Directory schema to store custom data for your organization. In PeoplePlatform, just add an Attribute wuse extensionAttribute1 to extensionAttribute15 as the LDAP attribute and give it a custom label like Skype ID. Make sure the attribute you choose isn’t being used for something else so you don’t use the same attribute for two different purposes.
Once you have the extensionAttribute defined in your PeoplePlatform configuration, you can add it to search, search results, details or edit pages. Have fun!