This question gives the interviewer the opportunity to learn your strengths. Simply saying: 'I increased social media engagement' isn't going to give your interviewer a sense of what you accomplished. Instead, tell them how you increased social media engagement for the company and why your help was valuable.

It's important to master the art of the humble brag to make a good impression. Feeling proud of your accomplishments is fine. Endlessly discussing your value to the last company you worked for gives the impression you are arrogant.