Twitter's shares are plummeting again after being downgraded by one Wall Street analyst to sell from hold.
The downgrade by Stifel sent shares down more than seven per cent and back under $17 per share and follows a sharp rise in Monday trading after takeover talk surfaced.
Stifel analyst Scott Devitt said: "We are returning our rating on Twitter shares back to where it should have been all along – Sell." A price target of $14 was given.
"Twitter is a product that has never fully developed into a sustainable public company due to either poor strategy, poor execution, or that it was never destined to be one," he added.
Slowing user growth and a raft of underwhelming new product features have failed to reassure investors and there have been several senior and high-profile exits at the firm in recent weeks. Analyst consensus gives Twitter a hold recommendation, according to Reuters.