On Mother’s Day, the marketing team for the San Diego Padres learned a valuable lesson about protecting its brand on social media, specifically, Twitter.The baseball team temporarily changed its Twitter handle from @Padres to @Madres to celebrate moms on their special day. It was a clever brand engagement idea, except the team did more than just change its display name for the day — it changed its whole Twitter handle and failed to immediately protect the @Padres handle in a separate, locked Twitter account …