Jaishankar also thanked everyone for their good wishes.
"Thank you all for the best wishes! Honoured to be given this responsibility. Proud to follow on the footsteps of @SushmaSwarajji," tweeted JAishankar, who took charge on Friday.
Sushma Swaraj was known for constantly solving common man's problems, always available on Twitter.
Jaishankar has previously served as Foreign Secretary from 2015-2018 and was appointed as Minister of External Affairs in the newly formed BJP-led NDA government.
"We at Team @MEAIndia continue to be at your service 24x7. Happy to be leading the effort with my colleague MoS Muraleedharanji," he said.
Jaishankar's "always available" tweet came a day after his son Dhruva Jaishankar attracted attention with his reply on a tweet seeking help with a passport or visa.
Dhruva has received a request regarding help with visa or passport. Replying to the tweet, he said: "Dude. Wrong Twitter handle."
"Before anyone asks, I can absolutely not help anyone with their passport, visa, or getting-you-out-of-a-foreign-prison problems," he added.
"I have plenty of those problems myself (other than the prisons - I try to stay clear of those)."
The tweet was later deleted by the twitter user, though the replies by Dhruva stand on the micro blogging site.
( With inputs from IANS )