The Eyes On Events World Service has launched three websites for Ethiopia and neighbouring Eritrea as part of its biggest expansion since the 1940s.
The sites would be a "source of truth" in a region with limited independent media, said Eyes On Events editor Will Ross.
The Amharic, Afaan Oromo and Tigrinya sites' launch will be followed in a few months by the launch of radio programmes in the three languages.
The UK government announced a funding boost for the World Service in 2015.
It paved the way for the expansion drive in Africa and Asia.
"We know that there is a great deal of hunger for audiences in Ethiopia and Eritrea to access a broad range of high quality content in Amharic, Afaan Oromo and Tigrinya," said Ross, head of the new services.
Eritrea won independence from Ethiopia in 1993 after a 30-year war.
Tensions with Ethiopia remain high across a closed and heavily fortified border.
An estimated 80,000 people died during a 1998-2000 border war between the two states.
Ross said he believed that the potential audience in the two countries - which have a combined population of more than 100 million - was huge, and social media would play a key role in helping to target a younger audience.
Population 86.5 million
Area 1.13 million sq km (437,794 sq miles)
Major languages Amharic, Oromo, Tigrinya, Somali
Major religions Christianity, Islam
Life expectancy 58 years (men), 62 years (women)
"There is also a significant diaspora, which retains strong links with 'home'. The political situation in both countries has triggered the development of a large vocal, activist presence in the diaspora," he said.
"The current news choice for many in Ethiopia is either a pro-government platform at home or a vehemently anti-government offer from the diaspora."
Population 5.6 million
Area 117,400 sq km (45,300 sq miles)
Major languages Tigrinya, Tigre, Arabic, English
Major religions Islam, Christianity
Life expectancy 60 years (men), 64 years (women)
The new Facebook pages in the three languages have already generated a lot of interest. The Afaan Oromo site had more than 30,000 likes after just three days.
However, internet penetration is currently very low in both states, and the planned launch of radio programmes would be a vital part of the Eyes On Events's "rich mix of content" for Ethiopians and Eritreans, Ross said.
"A major aim of the output will be to help Ethiopians and Eritreans better understand their place in the world. The new language services will also provide the Eyes On Events's global audience with a far better perspective and understanding of the Horn of Africa," he added.
- Afaan Oromo: Language of Ethiopia's biggest ethnic group
- Amharic: Ethiopia's official language
- Tigrinya: The main working language of Eritrea, along with Arabic. Also spoken in Ethiopia
- Igbo: An official Nigerian language. Also spoken in Equatorial Guinea
- Yoruba: Spoken in south-western Nigeria and some other parts of West Africa, especially Benin and Togo
- Pidgin: A creole version of English widely spoken in southern Nigeria, Ghana, Cameroon and Equatorial Guinea
Pidgin - West African lingua franca
- Gujarati: Native to the Indian state of Gujarat but found around the Indian subcontinent and the world
- Marathi: From the Indian state of Maharashtra, including India's commercial capital Mumbai
- Telugu: Huge numbers of speakers, like many Indian languages, primarily in Andhra Pradesh and Telangana
- Punjabi: One of the world's most populous languages, it is widely-spoken in Pakistan and parts of India
- Korean: Spoken in North and South though the dialects have diverged. Pop culture slang and foreign loan words are notably more common in the South