None. As a former MEP, Ms Mann does not need authorisation for her subsequent activities.
Since November 2011, Ms Mann has been the lead spokesperson for EU institutions for Facebook. Erika Mann “will also be an important contributor to the Facebook public-policy programme across the member states of the EU” (Source: Public Affairs News)
While she was an MEP, Ms Mann was a member of several MEP-industry fora including the Transatlantic Policy Network (TPN) and the Kangaroo group where she was a member of the board of the Working Group on Telecoms & Information Society. She was also a founding member and co-chair of the European Internet Foundation and was a member of the board in the Information Society Forum of the European Commission.

“There are currently no rules governing the revolving door for former MEPs and CEO regrets this. We consider that there should be a two year cooling-off period for ex-MEPs wishing to enter lobbying or consultancy roles, as a significant number of MEPs go onto this kind of work. Nonethless, CEO welcomes the fact that under the new Code of Conduct for MEPs, ex-MEPs who become lobbyists will have to surrender their lifelong access pass to the European Parliament for the duration of that work.”