TCS Capital Management, a significant shareholder in Yelp, is urging the company to explore strategic alternatives, including a sale or merger with Angi. This news has already led to a 9.75% increase in Yelp's stock price. If Yelp follows through with these recommendations, it could result in a further increase in the stock price, especially if the sale price is at least $70 a share, as TCS Capital believes.